Top 20 Sonic the Hedgehog Zones

This list was initially created to celebrate the 20th Anniversary of the Sonic the Hedgehog series. The idea was to go through each Sonic game and pick out my favourite zones. Well, last year I played through 52 zones spanning the classic Sega Master System, Sega Genesis, and Sega CD games. Out of those 52 zones, I managed to narrow this list down to 20. It was grueling to replay each game, but now I can proudly present you the Top 20 Sonic the Hedgehog Zones.
(Retro, Sega, Sonic the Hedgehog, Sonic The Hedgehog 2, Sonic the Hedgehog 3)

I realize it's an odd list, but these are my favourite zones. There are tons of Zones that could easily be swapped in, or out, but this was what I came up with immediately after playing through each game back to back.